code: def testInvalidReversalLines(self):
      with self.assertRaisesRegexp(
          Exception, "reversalLines must be greater than 1"
      ):
          barFeed = self.__getFeed()
          linebreak.LineBreak(
              barFeed[LineBreakTestCase.Instrument], 1, maxLen=2
          )
  
file_path: pyalgotrade/testcases/technical_linebreak_test.py
imports: import datetime
  from .None import common
  from pyalgotrade.technical import linebreak
  from pyalgotrade.barfeed import yahoofeed
  from pyalgotrade import dataseries
  from pyalgotrade import bar
  from pyalgotrade.dataseries import bards
label_desc: Use image node_id 6 for calling the LineBreakTestCase obj's underlying member method code with example usage: obj.testInvalidReversalLines() without return types